/*
Language: Device Tree
Description: *.dts files used in the Linux kernel
Author: Martin Braun <martin.braun@ettus.com>, Moritz Fischer <moritz.fischer@ettus.com>
Website: https://elinux.org/Device_Tree_Reference
Category: config
*/

/** @type LanguageFn */
export default function(hljs) {
  const STRINGS = {
    className: 'string',
    variants: [
      hljs.inherit(hljs.QUOTE_STRING_MODE, {
        begin: '((u8?|U)|L)?"'
      }),
      {
        begin: '(u8?|U)?R"',
        end: '"',
        contains: [hljs.BACKSLASH_ESCAPE]
      },
      {
        begin: '\'\\\\?.',
        end: '\'',
        illegal: '.'
      }
    ]
  };

  const NUMBERS = {
    className: 'number',
    variants: [
      {
        begin: '\\b(\\d+(\\.\\d*)?|\\.\\d+)(u|U|l|L|ul|UL|f|F)'
      },
      {
        begin: hljs.C_NUMBER_RE
      }
    ],
    relevance: 0
  };

  const PREPROCESSOR = {
    className: 'meta',
    begin: '#',
    end: '$',
    keywords: {
      'meta-keyword': 'if else elif endif define undef ifdef ifndef'
    },
    contains: [
      {
        begin: /\\\n/,
        relevance: 0
      },
      {
        beginKeywords: 'include',
        end: '$',
        keywords: {
          'meta-keyword': 'include'
        },
        contains: [
          hljs.inherit(STRINGS, {
            className: 'meta-string'
          }),
          {
            className: 'meta-string',
            begin: '<',
            end: '>',
            illegal: '\\n'
          }
        ]
      },
      STRINGS,
      hljs.C_LINE_COMMENT_MODE,
      hljs.C_BLOCK_COMMENT_MODE
    ]
  };

  const DTS_REFERENCE = {
    className: 'variable',
    begin: /&[a-z\d_]*\b/
  };

  const DTS_KEYWORD = {
    className: 'meta-keyword',
    begin: '/[a-z][a-z\\d-]*/'
  };

  const DTS_LABEL = {
    className: 'symbol',
    begin: '^\\s*[a-zA-Z_][a-zA-Z\\d_]*:'
  };

  const DTS_CELL_PROPERTY = {
    className: 'params',
    begin: '<',
    end: '>',
    contains: [
      NUMBERS,
      DTS_REFERENCE
    ]
  };

  const DTS_NODE = {
    className: 'class',
    begin: /[a-zA-Z_][a-zA-Z\d_@]*\s\{/,
    end: /[{;=]/,
    returnBegin: true,
    excludeEnd: true
  };

  const DTS_ROOT_NODE = {
    className: 'class',
    begin: '/\\s*\\{',
    end: /\};/,
    relevance: 10,
    contains: [
      DTS_REFERENCE,
      DTS_KEYWORD,
      DTS_LABEL,
      DTS_NODE,
      DTS_CELL_PROPERTY,
      hljs.C_LINE_COMMENT_MODE,
      hljs.C_BLOCK_COMMENT_MODE,
      NUMBERS,
      STRINGS
    ]
  };

  return {
    name: 'Device Tree',
    keywords: "",
    contains: [
      DTS_ROOT_NODE,
      DTS_REFERENCE,
      DTS_KEYWORD,
      DTS_LABEL,
      DTS_NODE,
      DTS_CELL_PROPERTY,
      hljs.C_LINE_COMMENT_MODE,
      hljs.C_BLOCK_COMMENT_MODE,
      NUMBERS,
      STRINGS,
      PREPROCESSOR,
      {
        begin: hljs.IDENT_RE + '::',
        keywords: ""
      }
    ]
  };
}
